Learn how to say Lingua Francas correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word lingua franca:
noun (plural lingua francas)
a language that is adopted as a common language between speakers whose native languages are different.
[mass noun] historical a mixture of Italian with French, Greek, Arabic, and Spanish, formerly used in the eastern Mediterranean.
late 17th century: from Italian, literally ‘Frankish tongue’